On modern operating systems, "deleting" a file isn't exactly deleting a file. Even setting aside the mechanics of how it's often possible to "un-delete" a file with specialized software, because it's ...

You delete a mountain of old newsletters, sweep them into Trash, and hit Empty. For a blissful moment, the folder looks clear. Then, bam, messages reappear like socks after laundry day. If Yahoo Mail ...